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<title>Section 5.1.&nbsp; Introduction</title>
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<h3 class="docSection1Title">5.1. Introduction</h3>
<p class="docText"><a name="idd1e34818"></a><a name="idd1e34823"></a><a name="idd1e34828"></a><a name="idd1e34831"></a><a name="idd1e34834"></a><a name="idd1e34839"></a><a name="idd1e34844"></a><a name="idd1e34847"></a><a name="idd1e34850"></a><a name="idd1e34853"></a>In this chapter, we describe the standard I/O library. This library is specified by the ISO C standard because it has been implemented on many operating systems other than the UNIX System. Additional interfaces are defined as extensions to the ISO C standard by the Single UNIX Specification.</P>
<p class="docText">The standard I/O library handles such details as buffer allocation and performing I/O in optimal-sized chunks, obviating our need to worry about using the correct block size (as in <a class="docLink" href="ch03lev1sec9.html#ch03lev1sec9">Section 3.9</a>). This makes the library easy to use, but at the same time introduces another set of problems if we're not cognizant of what's going on.</P>
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<p class="docText">The standard I/O library was written by Dennis Ritchie around 1975. It was a major revision of the Portable I/O library written by Mike Lesk. Surprisingly, little has changed in the standard I/O library after 30 years.</p>
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